Although not always labeled a "red scare" in history books, which of the following could be considered one of the first examples of a red scare?

Something that could be considered one of the first examples of a Red Scare is

a. The actions towards socialist revolution by the NSC.

As @Andriansp putted it, 
"Following the Russian revolution, United states undergone a massive worker's strike. Fearing the communist revolution, United states' attorney General allowed unwarranted arrest for those who is suspected as a communists"

b. is incorrect because that's referring to the space race and is irrelevant to this
c. is incorrect because Alger Hiss was convicted of being a soviet spy, not a communist
d. is incorrect because the IWW wanted to overthrow capitalism, which is the exact opposite of being afraid of communism almost

I hope this helps :)

a. The actions towards socialist revolution by the NSC.

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